Typewriter attachment



Aug. 26 1924.

2 Sheets-Sheet 1 HI H II II Illllll R G STARKE TYPEWRITER ATTACHMENTFiled Feb. 28. 1925 mum w wm Aug. 26. 1924. 1,506,031

R. G. STARKE TYPEWRITER ATTACHMENT Filed Feb. 28, 1923 2 Sheets-Sheet 2Patented Aug. 26, 1924.

UNITED STATES PATENT OFFICE.

ROBERT e. STARKE, on DELRAY, FLORIDA, ASSIGNOR or ONE-HALF TO rrrnononnM. ONEAL, or DELRAY, FLORIDA.

TYPEWRITER ATTACHMENT.

Application filed February 28, 1923.

To all whom it may concern:

Be it known that I, ROBERT G. STARKE, a citizen of the United States,residing at Delray, in the county of Palm Beach and State of Florida,have invented certain new and useful Improvements in TypewriterAttachments, of which the following is a specification, reference beinghad to the accompanying drawings.

This invention relates to typewriter attachments, and more particularlyto a device attachable to the carriage of a typewriter to be supportedthereby, and having means for holding carbon and second sheet paper forcontinual use with the carriage.

An important object of the present invention is to provide means forsupporting above the carriage of a machine carbon. paper to be utilizedwith the platen of the carriage, the carbonbeing mounted at its oppositeends upon a pair of rollers having novel and improved means maintainingthe carbon under tension preventing misalignment or crumpling of thesame.

A further object of the invention is to provide means for feeding thecarbon and a second sheet or carbons andcsecond sheets to the platenroller having means whereby the second sheets may be severed at a desired point.

-A still further object of the invention is toprovide a device of thischaracter which may be simply and inexpensively constructed, which isreadily operated, and

" which may be readily applied to the carriage.

An additional object of the invention is to provide a device of thischaracter which by slight changes in the attaching means employed forsecuring the same to the carriage may be applied to the carriages ofvarious makes of typewriters.

These and other objects I attain by the construction and arrangementshown in the accompanying drawings wherein for the purpose ofillustration is shown a preferred embodiment of my invention and whereinlike reference characters designate like parts throughout. i

In the drawings Figure 1 is afront elevation showing a typewriterattachment constructed in accordance with my invention applied to thecarriage of a typewriter;

Figure 2 is a side elevation thereof;

Serial No. 621,872.

Figure 3 is a section on the line 33 of Figure 1 and Figure 4 is adetail sectional view showing the mounting of the drive pintle of thecarbon rollers.

Referring now more particularly to the drawings, the numeral designatesside members of a typewriter carriage, 11 the rack bar connecting therear ends of the side bars, 12 the platen, 13 the paper tensioningdevice coacting with the platen and 14 the platen guides for guiding theedges of the paper during its pass-age about the platen. The partshereinbefore set forth are all parts of the normal construction of atypewriter carriage and form no part of my invention.

The numeral 15 designates inverted U- shaped members, the ends of thelegs 16 of which are provided with means for engaging the carriage atopposite sides thereof, one leg of each end member 15 in the presentinstance being shown as provided with a channel end 17 receiving aflange 18 of a sid member 10 and having a clamping screw 19 for engagingthe flange 18, the other of the legs being shown as having an offset end20 which is engaged by a clamp 21 embracing the rack bar 11 hereinbeforereferred to. These forms of construction may be altered as desired, theends of the legs merely engaging against rigid portions at the ends ofthe typewriter carriage at the front and back thereof. The bightportions 22 of the end members 15 are relatively widened as indicated,and have extending inwardly from their inner faces a pair of lugs 23 and24. Each end member has formed there-through at the lug 23 a bore 25opening therethrough in which is rotatably mounted a shaft 26 having asquared shank 27 at its outer end. Secured to the outer face of each endmember 15 is a casing 28 through which the correthe end members alignswith the lug 24 of the other of the end members.

The numeral 31 indicates rollers each roller 31 having atone end apintle 32 for engagement in a socket 30 of the lug 24 and at theopposite end with a flattened pintle 33 adapted to be engaged in a slot34 formed in the inner end of the stub shaft 26 and in which it may beengaged by movement through a slot 35 formed in the lug 2'3 and withwhich the slot- 34 of the stub shaft 26 is alignable. This slot isformed at the upper end of the lug and the roller is accordingly enteredfrom the top of the lug and is held in position within the slot 34 ofthe shaft by. gravity When aligned with this slot. WVh'en rotated or inany position except in alignment with the slot 35 of the lug 23, thepintle 33 is u'nremovable from the end of the shaft.

Secured to each end member at the higlit portion thereof and extendingupwardly therefrom is a spring arm 36, the spring of the arms urging thesame toward one another. Each arm 36 has its upper end furcated, asindicated at 37, the upper extremity of the furcated portion being bowedoutwardly, as indicated at 38. At the lower end of the furcation asemi-spherical socket 39 is formed having as its center the lower end ofthis furcation. The numeral 40 designatesa second sheet roller having atthe ends thereof semi-spherical portions 41 having axial pintles 42 of asize to enter the furcations 37 of'the arms 36. The distance between theends of the roller 40' proper is greater than the normal distancebetween. the spring arms 36. This roller is engaged between the arms byforcing the same downwardly with the p-intles engaged in the furcations37. The semi-spherical portions 41 will ride upon the arms at the sidesof the furcations, forcing the arms'outwa-rdly until the semi-sphericalsocket 39 is reached when the arms will spring inwardly clamping againstthe arms of the roller. l/Vhen in this position the roller is heldagainst upward movement and has a braking effect applied thereto by theengagement with its ends of the arms 36. At the same time it isrotatably mounted not only upon its pivots but upon the semisphericalportions 41 at the ends of the roller.

By the construction above set forth the rollers 31 are supported inspaced relation to and vertically above the platen 12 of the carriageand the roller 40 supported above the rollers 31 and in such a mannerthat it is readily removable for the placement of a fresh supply ofpaper. Assuming now that the roller '40 has thereon a supply of secondsheet stock and the rollers 31 a supply of carbon which is wound uponone of the rollers and passed about the platen roller 12 between theplaten roller and, the sheet tensioning device 13 and engaged with theother of the rollers, the second sheet being passed about the platenbetween the carbon sheet and the platen, it will beseen that if afirst-sheet be inserted at the back of the platen roller in the usualmanner, rotation of the platen Will cause the carbon to be withdrawnfrom the rear roller 31 and fed toward the forward roller 31. Theforward roller 31 has the spring 29 of the stub shaft 26 associatedtherewith fully Wound whereas the spring of the stub shaft 26 'of therearmostk roller 31 is released. This paper as drawn from the rearroller 31 of the platen is fed to the forward roller 31 and is woundthereon by the rotation of the roller under the influence of the spring29. At the same time paper is drawn from the roller 40 as needed and fedto the platen for use. The tension of the springs 29 will be such thatit may be overcome by the frictional engagement provided by thetensioning device 13 against "the platen 12. Accordingly the carbonpaper will continue to be fed from the rear or carbon feeding roller 31to the forward or carbon rewind roller 31. When the paper has been com--pletely withdrawn from the carbon holding roller, the spring thereofwill be tensioned and it will be obvious that by releasing the tension13 from the platen '12 this spring will act to rewind the paper upon thecarbon holding roller until the tension of thesprings 29 of the rollers31 becomes balanced. The completion of rew-indin-g upon the carbonholding roller may be accom-piished in either of two manners; a key maybe applied to the squared end of the stub shaft 26 associated therewithand rotated to draw the paper from the roller 31 against the increasingtension of its spring 29, or "the tensioningdeyice 13 of the platen maybe applied and the platen rotated to accomplish this result.

Secured to the forward legs of the end members 15 are the ends of a bar43 extending longitudinally of the platen and in proximity to the paperguide 14 thereof. To this bar adjacent :itsends is secured the ends of asecond bar 44 paralleling the "bar 43 and positioned slightly above andrearward-1y thereof. To the bar 44 are secured spring fingers 45,'thelower ends of which extend into proximity to the platen'12 and the upperends of which curve about the forward face of the forward roller 31 inspaced relation thereto. To the bar 43 are :secured spring fingers 46,the lower ends of which are vertically spaced above the lower ends ofthe spring fingers 45, these fingers curving outwardly and upwardly fromthe :bar 43. Between the spring fingers 45. and 46 the original sheet 47from the platen is :guided, thus preventing this sheet from fallingdownwardly and interfering with the oper ators view of the platen. Thebar 44 serves as a guide about which the carbon sheet 48 passes from theplaten 12 to the rewind roller 31. Secured to the bight portions of theend members 15 is a third bar 49 having extending upwardly therefromfingers 50 which are in spaced relation to the rewind carbon roller 31and have their upper ends curved forwardly, as indicated at 51. Thesecond sheet 52 is guided between the bar 49 and fingers 50 and thecarbon sheet 48 upwardly until its end engages against the curvedportions 51 of the fingers 50. This curvature causes the second sheet tobe directed outwardly and over the edge of a knife 52 extendinglongitudinally of the platen and having its ends secured to the endmembers 15. By engaging the second sheet with the hand, the same may besevered against the knife 52 at any desired point.

From the foregoing it will be obvious that a carbon sheet 48 is at alltimes held under tension and accordingly cannot become wrinkled orfolded upon the platen. It will furthermore be obvious that all of thesheets employed in the machine will be fully guided so that jammingthereof is prevented. While I have disclosed in the present instance asingle second sheet roller and a single pair of carbon rollers, it willbe obvious that the construction could be extended to provide forseveral duplicates without in any manner departing from the spirit of myinvention and I accordingly do not limit myself to the specificstructure hereinbefore set forth except as hereinafter claimed.

I claim 1. An attachment for typewriters comprising end members adaptedfor engagement with the carriage of the typewriter to be supportedthereby, a carbon sheet holding roller and a carbon sheet rewindingroller having their ends supported by said end members for rotation andsprings for said rollers tending to rotate the rollers in oppositedirections.

2. An attachment for typewriters comprising end members adapted forengagement with the car-riage of the typewriter to be supported thereby,a carbon sheet holding roller and a carbon sheet rew'inding rollerhaving their ends supported by said end members for rotation, andsprings for said rollers tending to rotate the rollers in oppositedirections of equal strength and each of insuh'icient strength to shiftthe carbon sheet engaged therewith against the action of the papertensioning device of the carriage platen.

3. An attachment for typewriters embodying a carriage having the usualplaten comprising a structure carried by said carriage including aplurality of rollers, a carbon sheet wound upon one of said rollerspassing about said platen and secured to a second roller, and means fortensioning said sheet at opposite sides of the platen.

4.. An attachment for typewriters embodying a carriage having the usualplaten comprising a structure carriedby said carriage including aplurality of rollers, a carbon sheet wound upon one of said rollerspassing about said platen and secured to a second roller, and meansengaged with said rollers rotating the rollers in a direction tending towithdraw the carbon sheet from the platen.

5. An attachment for typewriters embodying a carriage having the usualplaten comprising a structure carried by said carriage including aplurality of rollers, a carbon sheet wound upon one of said rollerspassing about said platen and secured to a second roller. and meansengaged with said rollers rotating-the rollers in a direction tending towithdraw the'carbon sheet from the platen, each of said means beinginsufficient to cause rotation of the platen.

6. An attachment for typewriters embodying a carriage having the usualplaten comprising a structure carried by said carriage including aplurality of rollers, a carbon sheet wound upon one of said rollerspassing about said platen and secured to a second roller, a second sheetwound upon a third roller and extending between said platen and saidcarbon sheet, said carbon sheet intermediate the platen and the secondroller serving as a guide to prevent folding of the free end of thesecond sheet in one direction, the carbon sheet engaging said secondroller at the side thereof next adjacent the second sheet, and fingersparalleling such portion of the carbon sheet preventing folding of thesecond sheet in the opposite direction.

7. An attachment for typewriters embodying a carriage having the usualplaten comprising a structure carried by said carriage including aplurality of rollers, a carbon sheet wound upon one of said rollers,passing about said platen and secured to a second roller, a second sheetwound upon a third roller and extending between said platen and saidcarbon sheet, said carbon sheet intermediate the platen and the secondroller serving as a guide to prevent folding of the free end of thesecond sheet in one direction, fingers paralleling such portion of thecarbon sheet preventing folding of the second sheet in the oppositedirection, and a knife positioned above said second roller, said fingersdirecting said second sheet over said knife.

8. An attachment for typewriters embodying a carriage having the usualplaten comprising a structure carried by said carriage including aplurality of rollers, a carbon sheet wound upon one of said rollers,passing about said platen and secured to a second roller, a second sheetwound upon a third free end of the second sheet in one direction,fingers paralleling such portion of the carbon sheet preventing foldingof the second sheet in the opposite direction, and a knife positionedabove said second roller,

said fingers directing said second sheet over said knife, the mountingof the third roller including means maintaining the roller in alignmentwith the platen and tensioning the roller to resist rotation thereof. 7

9. In combination with a shift-able earriage of a typewriter includingend frames, arack bar connecting the rear ends of the end frames and a.platen rotatably supported by the end frames, comprising a pair ofendmembers each embodying a pair of legs one of which clampingly engagessaid side member adjacent the forward end thereof and the other of whichengages said rack bar, a pairof rollers carried by said end members androtatable thereon, means engaging ther'ollers tending to rotate the samein opposite directions, a carbon sheet wound upon one of the rollers,passing about the platen and engaged with the other of the rollers, aspring arm secured to each of said end members and extending. upwardlythere from and having a furcated upper end, said spring arms" beingprovided in adjacent faces thereof at the lower ends of the furcat'ionsthereof with sockets, and a. second sheet roller provided upon its endswith pro-' jections adapted to engage in said sockets and with pintlesrotatable in said furca tions.

In testimony whereof I hereunto afiix my signature.

ROBERT Gr. STAR-KB.

